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3.
(noun) an event that may cause one party a source of entertainment due to the frustration of another party specifically-wanting something (food or toy) from McDonalds.

E.g. Keito was pissed off because they no longer served hashbrowns when she arrived at McDonalds about half a second too late! This McLetdown only provided amusement to her sibling who drove her there.
by fitchickxina April 30, 2006
 
1.
getting up (relatively)early, rushing to the local McDonalds, only to discover you missed the breakfast mark by .0005 of a second.
Guy that got dragged out of bed: Dude, that was such a McLetdown!
Guy that suggested it: sorry, man.
by bob_of_bobs April 14, 2006
 
2.
When you go out of your way to get a MsDonalds Hot Fudge Sundae, only to discover that the machine is broken.
McDonalds Dude: Can I take your order?
Jeff: Can I have a hot fudge sundae please?
McDonalds Dude: No, the machine is broken.
Jeff: Awwwwwwwwwwwwwwwwwww!!!
Heartless Friend: Hahahaa, what a McLetdown.
by The real D-Man April 30, 2006
 
4.
Looking forward to a McDonalds icecream all day only to find when you get there that the icecream machine isn't working/is empty/is being cleaned (although THAT one doesnt happen much) so you miss out.
Customer: Can I have a 50 cent cone please?
McDonalds Chick: Sorry, the machine isn't turned on.
Customer: @#%$! That is such a McLetdown!
by Icecream Fan April 30, 2006
 
5.
The feeling of dissapointment one gets when they're with MC HAMMER and he won't let said person touch anything.
*Vannila Ice hangin' out with MC Hammer, Ice goes to grab some chips*

MC Hammer: naananana, nana, CAN'T TOUCH THIS!!
Vannila Ice: damn bro.. What MC Let-Down..
Random Civilian: chronic fail man..
by Barca,A January 31, 2010
 
6.
Having a craving for McDonalds, going to a McDonalds, buying a hamburger, and tasting it.
McLetdown
Human#1: Dude, I had a McDonalds Humburger yesterday
Human#2: *shakes head* McLetdown!!
by SH8aP May 01, 2006
 
7.
Discovering, and worse swallowing, and worse yet wretching up blood and cutting my lip, as a result of foreign objects(sharp plastic) in my and my son's McDonalds sundaes. The first sundaes were watery so we returned them but got new ones with objects inside... I had nuts and my son didn't. I wish I hadn't asked for nuts and I wish I hadn't been served such a McLetdown!
McLetdown - Be glad that the sundae machine was down and you weren't served a sundae like mine because I had a scary McLetdown!
by McLetdowned Customer March 19, 2008